Definition: A redirection operator is a special character that can be used with a command, like a Command Prompt command or DOS command, to either redirect the input to the command or the output from the command.
The table below lists all of the available redirection operators for commands in Windows and MS-DOS. However, the > and >> redirection operators are, by a considerable margin, the most commonly used. See How To Redirect Command Output to a File for detailed instructions on using those operators.
Redirection Operators in Windows and MS-DOS
|>||The greater-than sign is used to send to a file, or even a printer or other device, whatever information from the command would have been displayed in the Command Prompt window had you not used the operator.||assoc > types.txt|
|>>||The double greater-than sign works just like the single greater-than sign but the information is appended to the end of the file instead of overwriting it.||ipconfig >> netdata.txt|
|<||The less-than sign is used to read the input for a command from a file instead of from the keyboard.||sort < data.txt|
||||The vertical pipe is used to read the output from one command and use if for the input of another.||dir | sort|
Note: Two other redirection operators, >& and <&, also exist but deal mostly with more complicated redirection involving command handles.
Tip: The clip command is worth mentioning here as well. It's not a redirection operator but it is intended to be used with one, usually the vertical pipe, to redirect the output of the command before the pipe to the Windows clipboard.
For example, executing ping 192.168.1.1 | clip will copy the results of the ping to the clipboard, which you can then paste into any program.
"My ISP wanted to see some evidence of my network issues so I used the > redirection operator with the ping command to save the results of that test in a text file."